I am involved in selling items to benefit the estate of a SK. One of the items is a unused roll of 400MAX cable that is still in the plastic cling wrap it was shipped in. I know there is at least 100
PhilThe way I do it is take the average diameter of 12" x 3.14 = circumference x number of turns = total length. That gets you pretty darn close. Tom H K0SN __________________________________________
See pages 15 and 16 of the RigExpert AA-55 Zoom User's Manual for "Cable length measurement". https://new.rigexpert.com/files/manuals/aa55zoom-bt/UserManual-AA-55ZOOM_en. pdf 73, Marsh, KA5M I am inv
Phil, Davis DRF-400 is the same as DXE400MAX, has foam dielectric and also double shielding. It is .068 pounds per foot. At .068 lbs/ft, 17 pounds would be 250 feet. Bob K6UJ ________________________
If you have an antenna analyzer that can measure complex impedance (as in R +/- jX) and if you are willing to put a connector on one end of the cable, I can tell you how to get an accurate length mea
I'd appreciate your sharing that with those of us casual users with antenna analyzers but who profess to be novices in their use. Have used it for some of the applications but still a learner. Mine h
Hi Phil, Did you call DX engineering and ask them what DXE400MAXDCU200 means. Might be 200 feet. Their customer support can probably decipher it. Good luck 73 Joe K2UF _______________________________
Author: Rod Greene via TowerTalk <towertalk@contesting.com>
Date: Sun, 12 Jan 2020 18:53:39 +0000 (UTC)
The circumference of a circle can be found by multiplying pi ( = 3.14 ) by the diameter of the circle. I've used this formula many times to calculate the length of a coil of coax. Do the above and mu
Yes. Although I own and frequently use test equipment for TDR, I use the average diameter method Tom describes to estimate the length of rolls of cable and rope. For cables having unknown VF, it's a
If you have an antenna analyzer that can measure complex impedance (as in R +/- jX) and if you are willing to put a connector on one end of the cable, I can tell you how to get an accurate length mea
For fairly long cable rolls (> 1/2 WL at the highest frequency where the analyzer provides accurate impedance data), it's pretty straightforward, Don: 1) Connect your analyzer to one end of the cable
Lp = 3514 ft * 0.81 = 2847 ft This is very close to what the guy was advertising, so I knew I wasn't being short changed. BUT -- VF for ALL transmission lines varies with frequency, and is typical
Yeah, I just did that with a large reel of RG6. I just stripped the cable back so about 1/4" of center conductor was exposed. I pushed the exposed center conductor into type-F jack of the adapter on
For an illustrated example of determining line length along with frequency-dependent VF see section "Line Length via Quarter or Half-Wave Points" (about half-way down the page) here: https://ac6la.co
200' as the part# indicates ? Maybe even math only, looks like roughly 200' -- Randy Lake N1KWF 73 Gunn Rd. Keene,NH _______________________________________________ __________________________________
Jim, Thanks for this info. Good stuff. FWIW, the lowest frequency I used was about 2 MHz. The 140 KHz was the frequency difference (not the absolute frequency) between adjacent points where the imped
If you can make the measurements shown, these two sites might help. https://www.quabbin.com/tech-briefs/method-calculate-capacity-reel-or-spool http://www.mossbergind.com/reel-calculator/ ___________
On 1/12/2020 3:55 PM, Michael Tope wrote: FWIW, the lowest frequency I used was about 2 MHz. The 140 KHz was the frequency difference (not the absolute frequency) between adjacent points where the im
<I am involved in selling items to benefit the estate of a SK. <One of the items is a unused roll of 400MAX cable that is still <in the plastic cling wrap it was shipped in. I know there is <at least
Author: Danny K5CG via TowerTalk <towertalk@contesting.com>
Date: Mon, 13 Jan 2020 10:52:14 -0800 (PST)
The length is right there in the model number, 200. <I am involved in selling items to benefit the estate of a SK. <One of the items is a unused roll of 400MAX cable that is still <in the plastic cli